C++ Senior Software Engineer – Fully Remote
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At a glance
- Employment type
- Contract
- Location
- Ireland · Remote within Ireland
- Workplace
- Remote
- Day rate
- €250/day (EUR)
- Category
- Full-stack
What you'll be doing
Senior C++ Software Engineer (Contract, Remote, Ireland) for a global fintech. Join a lean team to architect and build high-throughput, low-latency C++ applications powering international payments. Focus on greenfield projects, high-concurrency systems, and REST API integration. 6+ years C++ experience required.
- Design, implement, and maintain high-throughput, low-latency C++ applications for international payment flows
- Take full technical ownership of complex features from design and multi-threaded implementation through to testing and deployment
- Collaborate with senior developers, support engineers, and global technology partners to ensure reliability and performance
Key requirements
Must-have
- 6+ years of software engineering experience in production C++ environments
- Deep technical depth in multi-threaded programming and high-concurrency systems architecture
- Strong mastery of REST API design principles and microservices integration
- Solid hands-on experience with relational databases and writing performance-tuned SQL
Experience: 6+ years
Role signals
- Technical focus
- high-concurrency systems, C++ architecture, REST API integration
- Architecture / system design
- Indicated in the listing
- Hands-on vs management
- Hands-on
Similar jobs
Full job description
Senior C++ Software Engineer – Fully Remote
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Greenfield Projects
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Global Scale
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Fast Career Growth
Drive Global Financial Access Through High-Performance C++ Engineering
A well-established and rapidly expanding global fintech business is bringing on a Senior C++ Engineer to accelerate a core greenfield build.
The company’s underlying mission is financial inclusion—building modern payment technologies that provide vital financial services and enable life-changing payments to underprivileged and underbanked populations around the world.
This contract provides a rare mix of pure greenfield development, hard technical problems at scale, and real-world purpose. You’ll join a lean, highly capable core engineering team where your work will have high visibility and immediate impact. With minimal red tape, quick decision-making, and high trust, you can focus purely on doing what you do best: architecting and shipping clean, resilient, high-concurrency software.
Key Responsibilities
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Architect & Build: Design, implement, and maintain high-throughput, low-latency C++ applications that power critical international payment flows.
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End-to-End Delivery: Take full technical ownership of complex features from design and multi-threaded implementation through to testing and deployment.
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Collaborate at Scale: Work closely alongside senior developers, support engineers, and global technology partners to ensure reliability and performance.
What We’re Looking For
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6+ years of software engineering experience in production C++ environments.
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Deep technical depth in multi-threaded programming and high-concurrency systems architecture.
-
Strong mastery of REST API design principles and microservices integration.
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Solid hands-on experience with relational databases and writing performance-tuned SQL.
Contract Summary
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Role Type: Daily Rate Contract (Initial 6–12 month duration, strong likelihood of extension).
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Location: 100% Fully Remote.
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Rate: 250 per day.
To discuss rate expectations, contract terms, or project specifics in confidence, reach out to Samuel Knox on +353 1 960 9973 or send your CV directly to .
Interview prep pack
Grounded in this listing. Use it to prepare examples before you apply.
Your interview focus
Based on this listing, the role is a senior-level, hands-on C++ engineering contract focused on architecting and delivering high-concurrency, low-latency systems for global fintech payment solutions in a greenfield environment.
- C++ concurrency expertise·Medium
- REST API and microservices integration·High
- SQL performance tuning·High
Only have 30 minutes?
Follow a focused preparation plan based on this job.
Start 30-minute prep
Your 30-minute plan
Review High-Concurrency C++ Projects
0–8 minSelect 1-2 relevant projects where you solved concurrency or performance challenges and prepare concise, metrics-driven stories.
Refresh REST API and Microservices Knowledge
8–14 minRevisit your experience designing and integrating REST APIs in C++, focusing on real-world integration and scalability.
Prepare SQL Optimization Examples
14–20 minIdentify specific instances where you improved SQL performance and be ready to discuss your approach and results.
Draft Questions for the Interviewer
20–25 minWrite down 3-4 tailored questions about the team, project, and technical stack to demonstrate your engagement.
Practice Explaining End-to-End Feature Delivery
25–30 minRehearse a story that highlights your ability to own a feature from design through deployment, emphasizing autonomy and impact.
Talking points
, 5 itemsDesigning High-Throughput, Low-Latency C++ Applications
You will need to demonstrate experience architecting and optimizing C++ systems for speed and reliability, especially in financial or similarly demanding domains.
Multi-threaded Programming and Concurrency
The role emphasizes deep technical depth in multi-threaded programming; be ready to discuss specific concurrency challenges you've solved.
REST API Design and Microservices Integration
You should be able to explain your approach to designing robust APIs and integrating C++ services within a microservices architecture.
Performance-Tuned SQL and Relational Database Experience
Prepare examples of optimizing SQL queries and schema design to support high-volume, mission-critical applications.
End-to-End Feature Ownership
Showcase times when you took full technical ownership of a feature, from design through deployment, highlighting your autonomy and accountability.
What to research
, 4 itemsRecent C++ Multi-threaded Projects
Review and prepare to discuss specific examples of high-concurrency C++ systems you have designed or optimized.
REST API and Microservices Integration in C++
Be ready to explain your approach to designing, implementing, and integrating REST APIs in C++ environments.
SQL Performance Tuning
Refresh your knowledge of optimizing SQL queries and relational database schemas for high-throughput applications.
End-to-End Feature Delivery
Prepare stories that demonstrate your ability to own features from design through deployment, especially in lean teams.
Questions to ask
, 6 itemsWhat are the main technical challenges the team is currently facing with the greenfield payment platform?
Why ask this? To understand the immediate priorities and where your expertise can have the most impact.
Which C++ standards and libraries are most commonly used in your stack?
Why ask this? To clarify the technical environment and ensure alignment with your experience.
How is technical ownership and decision-making structured within the core engineering team?
Why ask this? To gauge the level of autonomy and responsibility you will have.
What is the typical process for testing and deploying new features in this environment?
Why ask this? To assess the maturity of CI/CD and quality assurance practices.
How does the team collaborate with global technology partners and support engineers?
Why ask this? To understand cross-team communication and integration expectations.
What does success look like for this role in the first six months?
Why ask this? To clarify performance expectations and key deliverables.
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